Nepal shut its only international airport in Kathmandu to large planes carrying aid on Sunday because of damage to the main runway since last week's devastating earthquake, officials said.

Medium and small aircraft will still be allowed to land.

The airport's main runway, which was temporarily closed, was built to handle only medium-size jetliners — not the large military and cargo planes that have been flying in aid supplies, food, medicines, and rescue and humanitarian workers, said Birendra Shrestha, the manager of Tribhuwan International Airport, located on the outskirts of Kathmandu.

There have been reports of cracks on the runway and other problems.

"You've got one runway, and you've got limited handling facilities, and you've got the ongoing commercial flights," said Jamie McGoldrick, the U.N. coordinator for Nepal, according to the Associated Press. "You put on top of that massive relief items coming in, the search and rescue teams that have clogged up this airport. And I think once they put better systems in place, I think that will get better."

The death toll from the April 25 earthquake reached 7,276, including six foreigners and 45 Nepalese found over the weekend on a popular trekking route, said government administrator Gautam Rimal. Nepal's Tourist Police reported that a total of 57 foreigners have been killed in the quake, and 109 are still missing, including 12 Russians and nine Americans.

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Rajan, a 37-year-old father of three, looks toward the building that collapsed over his wife and two sons after being informed by Nepali soldiers and Israeli rescue team IsraAid that the building where their bodies are still trapped will be sealed off due to being unstable and in danger of collapsing further. Diego Azubel, European PressPhoto Agency

A member of Israeli search and rescue team IsraAid sits on a pile of rubble from a destroyed building as he takes a break from trying to recover the body of a victim from the devastating earthquake in Balaju, Kathmandu, Nepal. Diego Azubel, European PressPhoto Agency

A member of a Korean search and rescue team sprays bug spray to get rid of a large number of flies in the area as they try to recover bodies of victims from the devastating earthquake in Balaju, Kathmandu, Nepal. Diego Azubel, European PressPhoto Agency

A flower blooms above destroyed homes in Bhaktapur, Nepal. Four survivors were rescued in northern Nepal, eight days after the earthquake hit the Himalayan country, officials said. The government updated the confirmed official death toll to 7,040, as reports of rescue workers digging out more dead bodies from the rubble in rural villages continue to pour in. Narendra Shrestha, European PressPhoto Agency

A search and rescue team from the Royal Thai Armed Forces together with members of the Nepalese army dig at the entrance of a home in search of the owner's body in Sankhu, Nepal. Diego Azubel, European PressPhoto Agency

Nomita Khadka leans on her crutches as she looks at the remains of her home in Kathmandu. Nomita escaped with only a twisted ankle after a devastating earthquake hit the Himalayan nation April 25. Roberto Schmidt, AFP/Getty Images

A boy walks across a suspension bridge leading toward the destroyed village of Baluwa, Nepal, on April 30. Villagers in quake-stricken Nepal distributed emergency provisions among themselves as official aid and rescue operations continued to be held up. Narendra Shrestha, European Pressphoto Agency

A mother carries her son in Uiya village, in northern-central Gorkha district, on April 29. Hungry and desperate villagers rushed toward relief helicopters in remote areas of Nepal, begging to be airlifted to safety, four days after a monster earthquake killed more than 5,000 people. Sajjad Hussain, AFP/Getty Images

Amos told the AFP that she raised the issue with Prime Minister Sushil Koirala on Saturday, reminding him that Nepal had signed an agreement with the U.N. in 2007 allowing simpler and faster customs clearance for aid.

"He has undertaken to ensure that happens, so I hope that from now we will see an improvement in those administrative issues," Amos told the news agency.